JP2007205780A - Electric energy examination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric energy examination device and an electric energy examination method for easily examining electric energy in a prescribed period while eliminating the risk of contacting with a live part. <P>SOLUTION: A watt-hour meter 22 emits the number of light pulses being proportional to electric energy from its error-test pulse light emitting part 32. A light pulse acquisition part 2 receives the light pulses emitted from the emitting part 32, converts the light pulses into a pulse signal, and outputs it to an integration part 4. The integration part 4 receives the pulse signal outputted from the acquisition part 2 to integrate the number of pulses. An arithmetic processing part 6 acquires a count value in each of prescribed cycles or when some event takes place. The processing part 6 calculates electric energy in an examination period from a prescribed conversion expression, based on the acquired count value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric energy investigation device and an electric energy investigation method for investigating electric energy in a predetermined period, and more particularly to a technique for eliminating the risk of a user touching a charging unit.

  2. Description of the Related Art Conventionally, energy consumption measures such as changing the device configuration and improving operation patterns have been taken based on the investigation of the amount of power consumed by a power load and temporal variations. It is sufficient to conduct such an investigation of the amount of power during a predetermined period. Therefore, the device used for the electric energy survey does not need to be permanently installed, but is installed only during the survey period and is removed after the survey. Therefore, it is desirable that the device used for the electric energy survey is easy to install and remove.

  Conventionally, an apparatus used for such an electric energy survey is also referred to as a load survey apparatus. For example, in Japanese Patent Laid-Open No. 58-205859 (Patent Document 1), a load measuring device that measures consumption of a consumer and stores the measured data in a memory at regular intervals, and a measurement stored in the memory are disclosed. A load survey apparatus having a data recorder for recording data is disclosed.

Japanese Patent Laid-Open No. 63-99444 (Patent Document 2) discloses a power consumption measuring device that measures power consumption between air conditioning units in a plurality of air conditioners.
JP 58-205859 A JP-A-63-99444

  In the devices disclosed in Patent Document 1 and Patent Document 2 described above, a load is used from a watt hour meter or wiring using a current transformer (CT: Current Transformer) or an instrument transformer (PT: Potential Transformer). It is necessary to obtain a current value and a voltage value flowing through the.

  However, installing a current transformer or instrument transformer in a state where a voltage is applied, that is, a so-called live line state, involves a risk of electric shock or the like.

  On the other hand, in order to avoid dangers such as electric shock, it is desirable to open the electric circuit and work without voltage, but when various loads are connected, the electric circuit can be easily opened. There are many things that cannot be done.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to eliminate the risk of contact with the charging unit and to easily investigate the amount of power in a predetermined period and It is to provide an electric energy survey method.

  According to the present invention, the optical pulse acquisition unit that is arranged in the vicinity of the watt hour meter that measures the electric energy based on the current value and the voltage value and acquires the optical pulse corresponding to the electric energy measured by the watt hour meter. And an integration unit that integrates the number of light pulses acquired by the optical pulse acquisition unit, and an arithmetic processing unit that calculates the amount of power in a predetermined period based on the number of light pulses integrated by the integration unit It is a quantity survey device.

  The electric energy investigation device according to the present invention calculates the electric energy in a predetermined period by an optical pulse acquisition unit arranged close to the watt hour meter acquiring an optical pulse corresponding to the electric energy. This eliminates the need for installing a current transformer or instrument transformer, or branching from the current transformer.

  Preferably, the watt-hour meter emits an optical pulse corresponding to the measured electric energy to the outside, and the optical pulse acquisition unit acquires the optical pulse emitted from the watt-hour meter.

  Alternatively, preferably, the watt-hour meter rotates the rotating member at a speed corresponding to the electric power to be measured and measures the electric energy based on the number of rotations of the rotating member, and the optical pulse acquisition unit An irradiating unit that irradiates the measuring light and a light receiving unit that receives the reflected light that is generated when the measuring light irradiated by the irradiating unit is reflected by the rotating member. And mark portions having different reflectivities.

  More preferably, the integrating unit includes a frequency dividing unit that divides the optical pulse acquired by the optical pulse acquiring unit by a predetermined frequency dividing ratio.

  More preferably, the integrating unit further includes a register unit that stores the number of optical pulses, and the frequency dividing unit prevents the maximum number of optical pulses integrated in a predetermined period from exceeding a maximum integrated value that can be stored in the register unit. Then, the optical pulse acquired by the optical pulse acquisition unit is divided.

More preferably, the frequency division unit can change the frequency division ratio according to the frequency division ratio setting command.
More preferably, the arithmetic processing unit includes a display unit that displays the calculated electric energy.

  According to the invention, from the watt hour meter that measures the electric energy based on the current value and the voltage value, an optical pulse obtaining step for obtaining an optical pulse corresponding to the electric energy measured in the watt hour meter, An electric energy survey comprising an integrating step for integrating the number of optical pulses acquired in the optical pulse acquiring step, and an arithmetic step for calculating the electric energy for a predetermined period based on the number of optical pulses integrated in the integrating step Is the method.

  The electric energy investigation method according to this invention calculates the electric energy in a predetermined period by acquiring the optical pulse according to the electric energy measured in the watt hour meter. This eliminates the need to install a current transformer or instrument transformer, or branch off from the current survey.

  According to the present invention, it is possible to realize an electric energy investigation device and an electric energy investigation method that can eliminate the risk of contact with a charging unit and can easily investigate electric energy in a predetermined period.

  Embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a schematic diagram of an electric energy survey using electric energy survey device 100 according to the first embodiment of the present invention.

  With reference to FIG. 1, the watt hour meter 22 is a trading meter that measures the amount of power flowing from the power source side to the load side through the power line 20 as an example. In FIG. 1, the case where the power line 20 is a three-phase three-wire AC wiring is illustrated, but the present invention is applicable to any of the single-phase two-wire type, single-phase three-wire type, and three-phase four-wire type. Is possible.

  The watt-hour meter 22 receives a current value signal corresponding to the current value flowing through each corresponding phase from the current transformers 24 respectively disposed in the two phases constituting the power line 20. In addition, the watt hour meter 22 receives a voltage value signal corresponding to each corresponding phase voltage from an instrument transformer 26 arranged between two different phases of the power line 20. And the watt-hour meter 22 calculated the electric power which is an instantaneous electric energy based on the current value signal and the voltage value signal received from the current transformer 24 and the instrument transformer 26, respectively, and the calculation The electric power is sequentially integrated to measure the electric energy. Furthermore, the watt-hour meter 22 displays the calculated power and the measured power amount on the power display unit 28 and the power amount display unit 30, respectively.

  As described above, when applied to other AC systems, the number and installation positions of current transformers and instrument transformers are different. Therefore, detailed description will not be repeated.

  Further, the watt-hour meter 22 further includes an error test pulse light emission unit 32. The watt-hour meter 22 radiates a number of light pulses proportional to the amount of power from the error test pulse light emitting unit 32. The light pulse emitted from the error test pulse light emitting unit 32 is compared with the light pulse emitted by the same type of watt-hour meter serving as a test standard, and used for the error test of the watt-hour meter 22.

  On the other hand, the energy survey device 100 according to the first embodiment of the present invention acquires a light pulse emitted from the error test pulse light emission unit 32 of the watt-hour meter 22, and determines a predetermined value based on the acquired number of light pulses. The amount of power during the survey period is calculated. The electric energy survey apparatus 100 includes an optical pulse acquisition unit 2, an integration unit 4, and an arithmetic processing unit 6.

  FIG. 2 is a schematic configuration diagram of electric energy survey device 100 and electric energy meter 22 according to the first embodiment of the present invention.

  Referring to FIG. 2, the watt hour meter 22 includes a power calculation unit 34, a power-pulse conversion unit 36, a signal processing unit 38, a power display unit 28, a power amount display unit 30, and an error test pulse. The light emitting unit 32 is included.

  The electric power calculation unit 34 calculates electric power which is an instantaneous electric energy based on the current value signal and the voltage value signal received from the current transformer 24 and the instrument transformer 26 (FIG. 1), respectively. Then, the calculated power is output to the power-pulse converter 36.

  The power-pulse converter 36 integrates the power received from the power calculator 34 every short time, and generates a number of pulse signals proportional to the amount of power per minute time. Then, the power-pulse conversion unit 36 outputs the signal to the signal processing unit 38 and the error test pulse light emitting unit 32. Thus, in order to improve the measurement accuracy of the electric energy, it is desirable that the number of pulses associated with the unit electric energy is larger. As an example, the power-pulse conversion unit 36 generates 1000 pulses with respect to the amount of power for 1 second at the rated power. That is, if the rated power is 1 kW, the power-pulse converter 36 generates pulses at a rate of 1000 pulses / 1 kWs.

  The signal processing unit 38 calculates power at each time point based on the number of pulses received per unit time from the power-pulse conversion unit 36, and outputs a signal corresponding to the calculated power to the power display unit 28. In addition, the signal processing unit 38 sequentially accumulates the number of pulses based on the pulse signal received from the power-pulse conversion unit 36, and outputs a signal corresponding to the amount of power corresponding to the accumulated number of pulses. Output to 30.

  The power display unit 28 receives a signal corresponding to the power received from the signal processing unit 38 and displays the power.

  The power amount display unit 30 receives a signal corresponding to the power amount received from the signal processing unit 38 and displays the power amount. In addition, in Embodiment 1 of this invention, although illustrated about the watt-hour meter 22 provided with one electric energy display part, it is necessary to measure the electric energy according to a time slot | zone according to the contract with an electric power company. In some cases, a watt hour meter including a plurality of power amount display units 30 may be used.

  The error test pulse light emission unit 32 receives the pulse signal output from the power-pulse conversion unit 36, converts the pulse signal into an optical pulse, and radiates it outside the watt-hour meter 22. Note that the error test pulse light emission unit 32 includes a photodiode as an example.

  On the other hand, the optical pulse acquisition unit 2 constituting the electric energy survey device 100 receives the optical pulse emitted from the error test pulse light emitting unit 32, converts the optical pulse into a pulse signal, and outputs the pulse signal to the integrating unit 4. . In addition, the optical pulse acquisition part 2 consists of a phototransistor as an example.

  The integrating unit 4 receives the pulse signal output from the optical pulse acquiring unit 2 and integrates the number of pulses (the number of rising times or the number of falling times). The integrating unit 4 includes a frequency dividing unit 12, a counter unit 8, and an interface unit (I / F unit) 10.

  The frequency divider 12 divides the pulse signal received from the optical pulse acquisition unit 2 by a frequency division ratio according to a frequency division ratio setting command received from the outside, and outputs the result to the counter unit 8.

  The counter unit 8 includes a register unit 9, detects the rising or falling edge of the pulse signal received from the frequency dividing unit 12, and stores the count value stored in the register unit 9 according to the detected number of rising or falling edges Increase.

  The interface unit 10 is connected to the counter unit 8 and the arithmetic processing unit 6, and reads a counter value stored in the register unit 9 of the counter unit 8 in response to a request from the arithmetic processing unit 6. Data is transmitted to the arithmetic processing unit 6. The interface unit 10 includes, for example, wired transmission such as USB (Universal Serial Bus), IEEE 1394, RS-232C, and PLC (Power Line Carrier), wireless LAN (Local Area Network), IrDA (Infrared Data Association), It consists of wireless transmission such as Bluetooth (registered trademark).

  The arithmetic processing unit 6 acquires the count value stored in the register unit 9 via the interface unit 10 at every survey period or at the timing when some event occurs. And the arithmetic processing part 6 calculates the electric energy in an investigation period from a predetermined conversion formula based on the acquired count value. Then, the arithmetic processing unit 6 digitizes or / and graphs the calculated electric energy and displays it on its own display unit. Furthermore, the arithmetic processing unit 6 can also perform analysis processing such as derivation of the maximum power amount and the minimum power amount. In addition, the arithmetic processing part 6 consists of a personal computer etc. as an example.

  As described above, the electric energy survey device 100 acquires the light pulse emitted from the error test pulse light emitting unit 32 disposed on the surface of the watt hour meter 22, and based on the light pulse, the electric power during the investigation period. Calculate the amount. Since the optical pulse acquisition unit 2 needs to reliably receive the optical pulse emitted from the error test pulse light emission unit 32, the optical pulse acquisition unit 2 contacts the error test pulse light emission unit 32. It is desirable to be arranged. Furthermore, when sunlight having a wide wavelength band is incident on the optical pulse acquisition unit 2, a measurement error occurs. Therefore, when applying to the watt-hour meter 22 arranged outdoors, a member that blocks sunlight is arranged. It is more desirable to do.

  By the way, the integrating unit 4 needs to integrate the number of light pulses in the investigation period, and the investigation period for investigating the electric energy varies depending on the target load. For this reason, it is necessary to increase the storage capacity of the register unit 9 as the investigation period becomes longer. On the contrary, when the investigation period is shortened, it is assumed that the actually accumulated value is smaller than the maximum accumulated value of the register unit 9 and the investigation accuracy is lowered.

  Therefore, in electric energy survey apparatus 100 according to the first embodiment of the present invention, frequency dividing unit 12 can change the frequency dividing ratio in accordance with an external frequency dividing ratio setting command. As a result, by changing the frequency division ratio according to the survey period, the storage capacity of the register unit 9 can be made economical, and the maximum integrated value (the registerable value of the register unit 9) and the actual integrated value can be obtained. The survey accuracy can be maintained by bringing the values close to each other.

FIG. 3 is a schematic configuration diagram of the frequency divider 12.
Referring to FIG. 3, frequency divider 12 includes set / reset flip-flops (hereinafter also simply referred to as “flip-flops”) 50.1, 50.2,. n is included.

  The flip-flop 50.1 receives the input pulse from the optical pulse acquisition unit 2 at the clock input CL, and operates at the rising or falling timing of the input pulse. In the flip-flop 50.1, “1” is always input to the reset input R, and the inverted output Q is input to the direct input D. Therefore, when the reset input R receives “1” in the operation at a certain time point, the inverted output Q becomes “1”. In the next operation, when the direct input D receives “1”, the inverted output Q becomes “0”. Thereafter, the same operation is repeated, and the flip-flop 50.1 performs a so-called toggle operation in which “0” and “1” are alternately switched and output for each operation. Therefore, two operations are required for the flip-flop 50.1 to output one pulse. Therefore, the flip-flop 50.1 that performs one operation with one input pulse outputs a pulse obtained by dividing the input pulse received at the clock input CL by ½. Further, flip-flop 50.1 outputs its output to selector unit 54 via inverter 52.1.

Since the flip-flop 50.2 receives the inverted output Q of the flip-flop 50.1 at the clock input CL, the pulse input to the clock input CL is halved similarly to the operation of the flip-flop 50.1 described above. Output the divided pulse. Therefore, it outputs a pulse that is 1/2 ² frequency-divided input pulses. Further, flip-flop 50.2 outputs the output to selector unit 54 via inverter 52.2.

Similarly, flip-flops 50. n divides the input pulse by 1/2 ⁿ and outputs it to the selector unit 54.

  Then, the selector unit 54 follows inverters 52.1, 52.2,..., 52. One of the pulses received from each of n is output as an output pulse.

As described above, the frequency divider 12 outputs an output pulse obtained by ^dividing the input pulse by ½ ⁿ in accordance with an external frequency division ratio setting command.

Below, the relationship between an investigation period and frequency division ratio setting is demonstrated.
As an example, the watt-hour meter 22 has a rated power of 1 kW, the power-pulse conversion unit 36 generates 1000 pulses per kWs, and the register unit 9 of the counter unit 8 counts 0 to 9999 (BCD 16 digits) in decimal. Suppose we can store a value. The count value range of the register unit 9 is assumed to be a value in a general-purpose counter device.

Under such conditions, if the load is 1 kW, the power-pulse converter 36 generates 1000 pulses per second. In consideration of an overload rate of 120% of a general meter, the power-pulse conversion unit 36 generates 1200 pulses per second at the maximum. Here, since the maximum count value of the register unit 9 is 9999, when the frequency dividing unit 12 is not used, the register unit 9 overflows in about 8 seconds. Therefore, by setting the frequency division ratio in accordance with the investigation period, it is possible to avoid an overflow of the register unit 9 and to accurately investigate the electric energy. As an example, if the investigation period is 5 minutes, it is desirable to set the division ratio to 1/2 ⁶ (= 1/64). If the investigation period is 30 minutes, the division ratio is 1/2 ⁸ ( = 1/256) is desirable.

  Thus, by optimally selecting the frequency division ratio in the frequency division unit 12, the storage capacity of the register unit 9 can be made economical, and the inspection accuracy can be maintained.

  In the above description, the configuration in which the frequency division unit 12 changes the frequency division ratio according to the frequency division ratio setting command from the outside has been described. An optimal frequency division ratio may be automatically determined based on the relationship with the storage capacity in the register unit 9.

  FIG. 4 is a flowchart of the electric energy investigation using electric energy investigation apparatus 100 according to the first embodiment of the present invention.

  Referring to FIG. 4, the user places optical pulse acquisition unit 2 in contact with error test pulse light emission unit 32 of watt-hour meter 22 (step S100). Then, the user inputs a survey period to the arithmetic processing unit 6 (step S102). Then, a setting command according to the investigation period input from the arithmetic processing unit 6 is transmitted to the counter unit 8, and an investigation period for the register unit 9 to accumulate the light pulses is set. Further, the user determines an optimal frequency division ratio from the relationship between the survey period and the storage capacity of the register unit 9, and gives a frequency division ratio setting command to the frequency divider 12 (step S104).

  The integrating unit 4 starts integrating the number of optical pulses received by the optical pulse acquiring unit 2 (step S106).

  The arithmetic processing unit 6 determines whether or not the set investigation period has elapsed (step S108). If the investigation period has not elapsed (NO in step S108), the arithmetic processing unit 6 waits until the investigation time elapses (step S108). When the investigation period has elapsed (in the case of YES in step S108), the arithmetic processing unit 6 acquires the count value in the counter unit 8 (step S110). And the arithmetic processing part 6 calculates the electric energy in the said investigation period based on the acquired count value (step S112). Further, the arithmetic processing unit 6 displays the calculated power amount on the display unit (step S114). Then, the process ends.

  Note that the user may set the survey to be performed multiple times. For example, the survey period can be set to 5 minutes, and the number of surveys can be set to 6 times. In this case, after obtaining the count value of the register unit 9, the arithmetic processing unit 6 clears the register unit 9 to zero and executes the next investigation.

  According to the first embodiment of the present invention, the light pulses emitted from the error test pulse light emitting unit arranged on the surface of the watt-hour meter are acquired, and the number of the light pulses is integrated over the investigation period. Then, the electric energy is calculated based on the number of integrated light pulses. This eliminates the need for installing a current transformer or instrument transformer, or branching from the current transformer. Therefore, it is possible to easily investigate the amount of power in a predetermined period without the risk of the user coming into contact with the charging unit.

  Further, according to the first embodiment of the present invention, by using the integrating unit including the frequency dividing unit, the size of the storage capacity of the register unit constituting the integrating unit can be reduced, and the cost can be suppressed. Furthermore, since a frequency dividing unit that can change the frequency dividing ratio according to the frequency dividing ratio setting is used, even when the storage capacity of the register unit is limited, an optimum frequency dividing ratio corresponding to the investigation period is selected. Therefore, high survey accuracy can be realized.

[Embodiment 2]
In the above-described first embodiment of the present invention, the configuration for acquiring the optical pulse generated by the watt-hour meter itself has been described. On the other hand, in Embodiment 2 of this invention, the structure which irradiates measurement light to a watt-hour meter and acquires an optical pulse is demonstrated.

  FIG. 5 is a schematic diagram of an electric energy survey using electric energy survey device 200 according to the second embodiment of the present invention.

  Referring to FIG. 5, watt-hour meter 23 is a trading meter that measures the amount of power flowing from the power source side to load side via power line 20, similarly to watt-hour meter 22 shown in FIG. 1. The watt-hour meter 23 is a moving magnetic field having an electromagnetic force corresponding to the electric power that is the instantaneous electric energy based on the current value signal and the voltage value signal received from the current transformer 24 and the instrument transformer 26, respectively. Is generated. Further, the watt hour meter 23 rotates the rotating member 33 with the generated moving magnetic field. Since torque corresponding to the electric power is given to the rotating member 33, the rotating member 33 rotates at a rotation speed corresponding to the electric power flowing through the power line 20.

  The watt-hour meter 23 displays the rotation speed integrated value of the rotating member 33, that is, the electric energy, in the electric energy display unit 29 mechanically connected to the rotating member 33.

  Note that the watt-hour meter 23 is an example of a “moving magnetic field type inductive meter”, and since such a moving magnetic field type inductive meter is a well-known technique, detailed description thereof will not be repeated.

  On the other hand, the electric energy survey device 200 according to the second embodiment of the present invention irradiates the rotating member 33 of the watt hour meter 23 with the measuring light, and the reflected light generated by the measurement light being reflected by the rotating member 33. Based on the above, the electric energy measured by the electric energy meter 23 is calculated. The electric energy survey apparatus 200 includes an optical pulse acquisition unit 3, an integration unit 4, and an arithmetic processing unit 6.

FIG. 6 is a schematic configuration diagram of an electric energy survey device 200 according to the second embodiment of the present invention.
With reference to FIG. 6, the optical pulse acquisition unit 3 includes a power supply unit 60, an irradiation unit 62, a light receiving unit 64, and a pulse shaping unit 66.

  The power supply unit 60 receives an internal power supply such as a battery or an external power supply (not shown), and supplies a constant voltage power supply to the irradiation unit 62.

  For example, the irradiation unit 62 includes a photodiode, receives power from the power supply unit 60, converts it into measurement light, and irradiates the rotating member 33 of the watt-hour meter 23.

  The light receiving unit 64 includes, for example, a phototransistor, and receives reflected light generated by the measurement light irradiated from the irradiation unit 62 being reflected by the rotating member 33. Then, the light receiving unit 64 converts the received reflected light into an electrical signal and outputs it to the pulse shaping unit 66.

  The pulse shaping unit 66 shapes an electric signal corresponding to the reflected light received from the light receiving unit 64 and outputs the electric signal to the integrating unit 4 as a pulse signal.

  Accumulation unit 4 and arithmetic processing unit 6 are the same as those of the first embodiment of the present invention described above, and thus detailed description will not be repeated.

  FIG. 7 is a schematic diagram showing irradiation of measurement light and reception of reflected light by the optical pulse acquisition unit 3.

  With reference to FIG. 7, the optical pulse acquisition unit 3 is arranged in the radial direction with respect to the rotation axis of the rotation member 33. Then, the irradiation unit 62 of the light pulse acquisition unit 3 irradiates the outer peripheral surface of the rotating member 33 with certain measurement light.

  In many cases, the rotating member 33 is made of a glossy metal material such as aluminum, and a mark portion 66 is formed on a part of its outer peripheral surface by painting such as red or black. The mark portion 66 may be formed by cutting out a part of the outer peripheral surface of the rotating member 33. And the mark part 66 has a low reflectance compared with the other outer peripheral surface of the rotation member 33 other than that. Therefore, the light intensity of the reflected light that is reflected by the mark portion 66 is smaller than the light intensity of the reflected light that is reflected by the other outer peripheral surface. Therefore, as the rotating member 33 rotates, the reflectance viewed from the light receiving unit 64 changes with time. The reflected light generated by the measurement light being reflected by the change in reflectance becomes an optical pulse.

FIG. 8 is a diagram illustrating a time waveform in each part of the optical pulse acquisition unit 3.
FIG. 8A shows measurement light emitted from the irradiation unit 62.

FIG. 8B shows reflected light received by the light receiving unit 64.
FIG. 8C shows a pulse signal output from the pulse shaping unit 66.

With reference to FIG. 8A, the irradiation unit 62 irradiates the rotating member 33 with measurement light having a constant intensity.
With reference to FIG. 8B, as the rotating member 33 rotates, the light intensity of the reflected light generated by reflecting the measurement light changes in a pulse shape corresponding to the position of the mark portion 66.

  Referring to FIG. 8C, the pulse shaping unit 66 inverts the pulse waveform of the reflected light received by the light receiving unit 64 and outputs the result. Pulse shaping unit 66 is not an essential component, but an integrating unit having the same configuration as the integrating unit in electric energy survey apparatus 100 according to Embodiment 1 of the present invention can be obtained by inverting the pulse waveform of the reflected light. Can be used. That is, the integration unit 4 and the arithmetic processing unit 6 other than the optical pulse acquisition unit can be shared, and the optical pulse acquisition unit 2 according to the first embodiment of the present invention or the optical pulse acquisition unit 3 according to the second embodiment of the present invention is selected. This is applicable to any watt-hour meter. Therefore, the cost of the entire apparatus can be suppressed.

  About the flowchart of the electric energy investigation using electric energy investigation apparatus 200 according to Embodiment 2 of this invention, the flowchart of the electric energy investigation using electric energy investigation apparatus 100 according to Embodiment 1 of this invention shown in FIG. Detailed description will not be repeated.

  In the second embodiment of the present invention, the configuration including the integrating unit 4 including the frequency dividing unit 12 has been described. Generally, the number of rotations per unit time of the rotating member 33 is determined according to the embodiment of the present invention. 1 compared to the number of light pulses emitted from the watt-hour meter 22 per unit time. Therefore, in the case where it is exclusively connected to the optical pulse acquisition unit 3 according to the second embodiment of the present invention, an integration unit in which the frequency division unit 12 is omitted may be used.

  Further, in the second embodiment of the present invention, the case where it is applied to a watt-hour meter of a moving magnetic field induction type meter has been described, but the same applies to a watt-hour meter that causes a physical displacement in accordance with the power amount. Can be applied to. For example, a rotary display or the like may be configured to detect the rotation of the least significant digit indicating panel.

  According to Embodiment 2 of the present invention, reflected light (light pulse) generated by irradiating measurement light onto a rotating member having a mark portion formed on a part of its outer peripheral surface and reflecting the irradiated light. ) Is generated. Further, the number of generated light pulses is integrated over the investigation period to calculate the amount of power. This eliminates the need for installing a current transformer or instrument transformer, or branching from the current transformer. Therefore, it is possible to easily investigate the amount of power in a predetermined period without the risk of the user coming into contact with the charging unit.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram of the electric energy investigation using the electric energy investigation apparatus according to Embodiment 1 of this invention. It is a schematic block diagram of the electric energy investigation apparatus and electric energy meter according to Embodiment 1 of this invention. It is a schematic block diagram of a frequency division part. It is a flowchart of the electric energy investigation using the electric energy investigation apparatus according to Embodiment 1 of this invention. It is a schematic diagram of the electric energy investigation using the electric energy investigation apparatus according to Embodiment 2 of this invention. It is a schematic block diagram of the electric energy investigation apparatus according to Embodiment 2 of this invention. It is a schematic diagram which shows irradiation of the measurement light by the optical pulse acquisition part, and light reception of reflected light. It is a figure which shows the time waveform in each site | part of an optical pulse acquisition part.

Explanation of symbols

  2, 3 Pulse acquisition unit, 4 integration unit, 6 arithmetic processing unit, 8 counter unit, 9 register unit, 10 interface unit (I / F unit), 12 frequency division unit, 20 power line, 22, 23 watt hour meter, 24 Current transformer, 26 Instrument transformer, 28 Power display unit, 29, 30 Power amount display unit, 32 Error test pulse light emitting unit, 33 Rotating member, 34 Power calculation unit, 36 Power-pulse conversion unit, 38 Signal processing Part, 50.1, 50.2,... n set / reset flip-flop, 52 inverter, 54 selector section, 60 power supply section, 62 irradiation section, 64 light receiving section, 66 pulse shaping section, 66 mark section, 100, 200 energy survey device.

Claims (8)

An optical pulse acquisition unit that is arranged in proximity to a watt hour meter that measures the amount of power based on a current value and a voltage value, and that acquires a light pulse according to the amount of power measured by the watt hour meter;
An integration unit for integrating the number of light pulses acquired by the optical pulse acquisition unit;
A power amount investigation device comprising: an arithmetic processing unit that calculates a power amount in a predetermined period based on the number of light pulses integrated by the integration unit. The watt-hour meter emits a light pulse corresponding to the amount of power to be measured to the outside,
The electric energy investigation device according to claim 1, wherein the optical pulse acquisition unit acquires an optical pulse emitted from the watt-hour meter. The watt-hour meter rotates the rotating member at a speed according to the power to be measured, and measures the electric energy based on the number of rotations of the rotating member,
The optical pulse acquisition unit
An irradiation unit for irradiating measurement light to the rotating member;
A light receiving unit that receives reflected light generated by the measurement light irradiated by the irradiation unit being reflected by the rotating member;
The electric energy investigation device according to claim 1, wherein the rotating member has mark portions having different reflectivities on an outer peripheral surface irradiated with the measurement light.   The electric energy survey device according to claim 1, wherein the integrating unit includes a frequency dividing unit that divides the optical pulse acquired by the optical pulse acquiring unit by a predetermined frequency dividing ratio. The integration unit further includes a register unit for storing the number of light pulses,
The frequency divider divides the optical pulses acquired by the optical pulse acquisition unit so that the maximum number of optical pulses integrated in the predetermined period does not exceed the maximum integrated value that can be stored in the register unit. The electric energy survey apparatus according to claim 4.   The power amount investigation device according to claim 4 or 5, wherein the frequency division unit can change a frequency division ratio in accordance with a frequency division ratio setting command.   The power calculation device according to claim 1, wherein the arithmetic processing unit includes a display unit that displays the calculated power amount. An optical pulse acquisition step of acquiring an optical pulse according to the electric energy measured in the electric energy meter from the electric energy meter that measures the electric energy based on the current value and the voltage value;
An integration step of integrating the number of optical pulses acquired in the optical pulse acquisition step;
A method for investigating the amount of electric power, comprising a calculation step for calculating an electric energy in a predetermined period based on the number of light pulses integrated in the integrating step.

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